Comments on Rising Electron Flux during Rising Electron Temperature in Spacecraft Charging

Physics – Plasma Physics

Scientific paper

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[7815] Space Plasma Physics / Electrostatic Structures, [7853] Space Plasma Physics / Spacecraft/Atmosphere Interactions, [7855] Space Plasma Physics / Spacecraft Sheaths, Wakes, Charging, [7899] Space Plasma Physics / General Or Miscellaneous

Scientific paper

This is to comment on two methods for indicating the onset of spacecraft charging. They are (1) rise of ambient electron flux in the 20-40 keV channels and (2) plasma temperature T exceeding a critical temperature T* which is typically a few keV depending on the surface material. We show in the theoretical framework of Maxwellian plasmas that the two phenomena are consistent with each other. However, method (1) is purely empirical, as it neglects surface material properties, whereas method (2) is "rigorous", within the Maxwellian approximation. The advantage of method (1) is simplicity, but the disadvantage is that sometimes (perhaps rarely) it can produce "false positives" i.e. the method always gives a surge in flux for large T, but if T is less than T* there is no charging. The relevant point is that the two methods are not equivalent, unless T exceeds T*.

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